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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac4c912d399813be3baceb40c1079b89a24f1100f201a0b9794637a3b89c907' 
  AND token = 'cbA+HlHSS8VKs84ABPuHsLEDCzu+eLWxjnDqqPnZGR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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