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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98219da7d3fa13958d9e1270b994332c41abd3a67aafa454c3f98d1aff431a53' 
  AND token = 'zYBVmga0j9RL2n/sXdeZnHRkBqZg1d4hSVU/gddBvyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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