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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7336805a3a6edc0c9b414ae7a79eb76f29e5858df4a383eadc3e009e038bcb1f' 
  AND token = 'aF9BxNP7s+7Teqp6/64rA9vDcNly/S5Wog+//31wooc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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