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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77cd053f63188c46fd8781a88e4dcb756c3866f6d723c2db370c0c1933947c6' 
  AND token = 't9yEU5ujBw0714cZgAGFBR6iFnZYNEtSJUtwgpmj3Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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