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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e658ef3616fa9f9b411f1a70507435214ac214272b60e63e8739e109e6bab4' 
  AND token = 'qMiZ9L7Vi+/QDoXws6E9ymoFmrdR0LU0BhqsJ3EezSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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