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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96677c62d3ba4acf36567d239382e831ee4ab8118f57516fcaf215460611408' 
  AND token = '0+G0drYclY8HZvwyESGApd89o0/Ym8uVoyJA3d5t3sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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