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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55465d0116a10774270ce8fee660a450110ea63cba35c01d82139be0baa764fd' 
  AND token = 'Egz29FZRMu/hMpWS6PWcMYtaug7MI5fi3ASg9nShVlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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