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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db94c7a40f7b2af985ac70b297f865c5d3fff15b5cbe6eb25d12f10dad81e805' 
  AND token = 'sRNBMFq9AWYvlRDSq4Ai6+Ozdw+Oh4WyoAtsN2hQfEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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