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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e397aa23d4729aa7d2db2db13e9381515722194acdc5c53fb0a8b1bc5af9870b' 
  AND token = '+6epLpomTW8cs6FtH/iLbG3xT6/nsHwtnRF5q9jEh+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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