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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46a12ea36b2914051c21140499c7e7b8b39db5ff01b1030c4bb71675bcb904c' 
  AND token = 'hR5odM58u4nq6xvcRWInFpZuxDIsBsVF30mQWN4v1tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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