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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9beabdc98a083b383e10c7bd3908142b6e7bdd3c1306fd6d23ca24883260b55e' 
  AND token = 'aos+V4HpQN4UnsHs62ZWkw29ci5X5Zb46tr5E1gFYzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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