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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c728077162dba886767bcd58d2f701f1630680dcc6ad8424101a1fc7ad554041' 
  AND token = 'tkCFbirzhXx7ghPrFG60s9R6bQAhUQyo2ilGqmH8h7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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