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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed2f068f8ba30234b8570f57a28b7d2f3d3b9f33fc8996716eea371d66936ee' 
  AND token = 'aksf0B172v55pFspKqsGdLIvyEY1qXm4cEqMe+Yd7gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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