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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3516efbf624beed864a1d20751a2e02971c1e509bc18b1066c07fe0fe6bf1dde' 
  AND token = 'mMCBDb3jo6iUXwR5GHGr1jqpBdrmiqAOGSIQRKOckuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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