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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19d23f3a6a0736b65f2b46be0f2309c998799f26a0dee443fe9d064e6eef9e7' 
  AND token = 'cXjy9mRWVpbauKhbYIQoxZ9Ld/UoarRWWOxfNRLT9Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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