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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0948c23e176450b227d5d06bfbac651453f0db9369f2984c8ae39da2873ad709' 
  AND token = 'hGj9FxVRL+NsSUEN7RCrT152hOhaYiz06ij16pos8w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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