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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ff2208d497b76427f0cd863a10c808738c473282efe091450d6e453acec3f5' 
  AND token = '1IV/ob89/NLL+2xli0RMwnkfTksPkX1v0Hn2w8FLkfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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