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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc85763f467272735619e1b41ed21bcd08d9eecf5082068940f08d0182a78a5' 
  AND token = 'j0oON08W6Zja/p/f6tYvJ81GmmRlDECDhTiTJci1GWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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