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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90993a0334c8f56bb93539c42ab38319679715a12e9752d8c68a12745f8f02f4' 
  AND token = 'YIvTZFu77qIhPqtn/27AVtavPs71T/tmx4NbV5njZlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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