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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72576b844eb25f179515fa43b47ab24f915a2dcc4464676e781fffcbe4928cc7' 
  AND token = 'tb+8pSzph3C+/zY1hoz1gtF5zke4/vWTSPZlIst0n08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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