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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfed8564d37d311190ae278dcf1402d0a4f9a03d5011b541cb686a0708e5d58' 
  AND token = 'qVAEkBSfZkbD4ET0HpDJte0XKAH/58WmO6cgSgVwaWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}