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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babd730acb0324e27bc10b18f231ba834a75cae91f9013ae201f6d8ae6a40b5a' 
  AND token = 'bsnpqGrZ7Nc90oh90yz5RNK1TFKKQf8PVCRJPB8KSTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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