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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f771e27c82a4d03ed32fdd9ec22ce3929ce837b5c82e2a686c2c13a1fa09923a' 
  AND token = 'Ts8LRc+UmRE0KHKcdMFM0p5Jf/1fExRE2sPNyDCagRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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