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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a927222864cb5a8b0a8f8932542cd0cc4c61020a398d1f8e626b5f5a106b8e' 
  AND token = 'SFHBtjS0IaBOlRKj3ZTWxwiKvl2qbI2s0tQrXk7VcC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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