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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37818f195827db9d6a23c033c72a571e117aa60588840cdc8157bf72189db1c' 
  AND token = 'yKsw4jqRHK4la1E/dEdHS8o3EayFPlADTOj6XLKOw3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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