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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994095c02f0f90b87e23ad02940b2dcf439015d1fa15916946181df92eda9c71' 
  AND token = 'SgMyQAc21+6tW3WrG7Gbaam9xJNEU4VoL7XvKfN3eDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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