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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5adc4cd23c5baf07970df7ab8665022f7ad0456cf06fe178eca6926a9ab2e96b' 
  AND token = '8/sKWcvNg9ti2+v1wAfOaABF8myx8uYadIJXk25r/jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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