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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad8c5837df40b74310b031c40d0eec3372767f545da1f93400f312ab0ad3855' 
  AND token = 'Wl7kvH6pWnRGkS7NyLsIPqbUyMcNDOSRfnUoc/cc/lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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