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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ba404c7dfcacb08bda550fff36a7cab0c8245b5085b844d45bc3f9ecab46b0' 
  AND token = 'gv3C73GaHoIYvCVVRT4UcjPQ2F381Cpg4YHxq/pLWe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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