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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd757ea7ae350a990466e6c2828fac397f58323a106199dbd7b7c655fee492c' 
  AND token = 'evX8ThsatC02MvXUJDlWkzBirvPlEH/RJWDZCjxbllQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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