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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2889bdeed9b6e6108d893e86bfbbcf6b7ac490d3b723d105aa4a2c09caf923' 
  AND token = 'v2WZTiiAVfYD+lnAXBvKgz18Tg/NI/OtskpfxZv+ae8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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