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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf849931db0e818ea2522469b155914d600cef28ee68269f3644a929da0e9dd' 
  AND token = 'Q/97JL7AkfYAViHsW3ovW8j0CFidlkk+eWbly2SBk6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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