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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dceac41ef85593977502522a6ca21f402f2eee1a74d22dcff0bad92da82d957' 
  AND token = '+Z3PzrClMsQFQvJCaqAP7j72+HvV53a+Bhte0CzyE8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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