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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7f9dcbf22d9a4ff52a462e9cb1187752d4e43f2edf4e6003f379eb9cbac7e4' 
  AND token = 'SMI+i1vXFP3Tf+B/h2dOwASwSe81YB7FFFEoXRrAmC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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