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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaacbd81b2e52e2f0d505c48a3311937bf15d4b17014ccb0aa5bc494844cfe6' 
  AND token = '5cZeBwftZReE225txVLW4gk3XjdHSRf+gxu5DhpZ8Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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