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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9adbe09eb8525e87bf0a2fdbac13200d9ab86a55c8f171828f5e374747242bd' 
  AND token = 'x5Zrr42RbO/jNh322bJjQnBr71x21YZEZHBEm0OfQjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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