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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e55f677f4dc6e3b2eef02e1534968510ce7c7d210a744c4660c0b344098dd8' 
  AND token = '1LaVKZQ3evGMzVyHBiDX+8lplicK65Q39ZG69bCDmSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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