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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e8f58683567579d83bd6afe3be6c8236f5dc09d5ea67260846ee9199d8816d' 
  AND token = 'E2BxUJ9G9x6MAsP2s7ieNWu4xqNJW0Gyn4TvqIqEAXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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