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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40028fda702c2c563c67b24c88867d64afbff520dc46aaa483da4d298366e68' 
  AND token = 'NPab9rpL1niB86g374amHHkkDYiF7VUljA5SahL/kvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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