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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdccf72e4bdbc1d62cec2f1615aaa4a4c0453ba1829bda5566fd514799521cb8' 
  AND token = 'zoK3tN95RKB8TErKd/4mNtBc1nNnHm4IMI4viVwdTHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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