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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04e4189e846ff015cb06ab392296e0736e6b75a2f79246d8c87df46a29984d2' 
  AND token = '9PqoNB01M3hLcs6YbLBECZDCPo6/bqgXB/zy5pW1I8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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