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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d52e4a50e4dcefa581cdd7ddb838f4718cffaf66fae23f26844711cecadefc' 
  AND token = 'SRV1OkMqVgMO5dURmTA9qaGyVAe9MMxqHfIFHy7rl64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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