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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34e6212fed94df9b8997cce889dc1cc6eba46443620256f2cef27b92c6478f8' 
  AND token = 'aO5RM7eYeHb/ag5ZSb7pjzCcjH83GY27u8t6SVTjxX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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