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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316b7bcadcb77c156b510e2ec3626eebbbb7f62744bb902d928184fe61671d60' 
  AND token = 'OKS4tmtEg+rXCn5Q8rl+RnucXonZKBx3u7i8s+3QVRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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