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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c05dab9adc423063e84f180da5494ea5bc3e60338ec97b2626ea2da18acb02' 
  AND token = 'O66XO4+/HzeKbY3nUHChX+JUPuzeXu6yFG6uqF5vSrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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