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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f93fb0ceb91d658d4099e0833ac156f20ea8bc1c7d88bc69f273a0a26526eeb' 
  AND token = '6ed360ifaeopszoG99ziZpfPrZggzjvpaWPR9AQARwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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