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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eaa0286c31fc5202e6ddacd8d8fc5664c2cb5f217b94e1df45b8d77743f690e' 
  AND token = 'bZPWMSnvnzTv8WYPiAMGzb2a/kqinnEtKJqI0YVk6FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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