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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8970533e1ff6bcc525f283aabe3c5ba734e342493e09b1c3f605edfc27f2ea9' 
  AND token = 'eJozjjhz/YPqNznfB7b/7EzPR4dArCa/5w50uMOsxaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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