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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2984c55dac94658830383ea086c1a2834c9609518ff8d5cd1e69af1599d7a56' 
  AND token = 'x5xSUEsqzpJFKdBG/rv0nYgTAd/K6qnHsIusifE25FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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