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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa8f0d37389d7d5c3eed9927b57aad50dc95e98f849d4b6dbd24a6057179791' 
  AND token = 'OwJakkA4T/3atZ79lHIrDoX30YAmmaBeOvfE4Yuo2Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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